Fire escape – ladder – or scaffold – Horizontal traversing - actuation – control – or response – Occupant actuation or control
Patent
1977-03-07
1978-10-17
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Horizontal traversing - actuation, control, or response
Occupant actuation or control
182128, 182142, E04G 310
Patent
active
041203780
ABSTRACT:
A movable work support particularly adapted for use within a silo or similar cylindrical structure is disclosed herein. The work support comprises a frame supporting a work platform and a winch mechanism. A cable extends from the winch to a point of securement at the top of the cylindrical structure, and extension or retraction of the cable from the winch mechanism will cause the framework to lower or raise, respectively. A first pair of wheels is located at an end of the frame opposite the location of the work platform. The first pair of wheels is positioned to engage the side wall of the structure and to roll along the side wall as the frame is moved vertically. A second pair of wheels is mounted near the first pair of wheels on the frame and is oriented to roll along the side wall as the frame is rotated in a horizontal plane within the structure. The first and second pairs of wheels are located such that the center of gravity of the work support is displaced from the point of attachment of the cable at the top of the structure in a direction away from the pairs of wheels. The frame is thereby urged in the direction of the pairs of wheels to ensure frictional engagement of the wheels with the side wall of the structure.
REFERENCES:
patent: 1073293 (1913-09-01), Sideman
patent: 3464520 (1969-09-01), Anderson
patent: 3643761 (1972-02-01), Melton
Mills E. Bennett
Mills Ernest E.
Mills Stanley L.
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